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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bcacd23579bdce95129822ff3cfa4888f8d3971e7356d22bb99e434482f0f2a' 
  AND token = '6HSyOBx29nSBjeg0/2j/tciLUOLDXea914nQOlGlwts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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