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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584c4957b87ec6d0d68055e0f1a098ebd6627f76d4c6b5a7d6287fb24a1695f4' 
  AND token = 'sFmoRv4G2ZHG9f2+ERbnI+b8tpQ2OtVSjx0DSb4g4Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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