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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7334a150ab548294e3542f411241a21f7a3f43ded7d8463ba10dbe2e1757f3b3' 
  AND token = 'd+GkEWgs+6PUFlze0vmRhL8tB28QxzDALodyMn6xR6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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