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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa84a564951ae3bb28ca600db21793b740b805761c40f62aa3916fa6107f457' 
  AND token = 'dnGWS4e73F2tmA1+B5Y5Lm/zoi3UG2b1Ei0MMlANhks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}