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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb302bc96467da8c39fb8cd0e3d46fdc92b70d58fc5ff95f4c4b66654489d239' 
  AND token = 'IQPd2vSIAgukFlvEAm53pK4cIGLQOMaR4w4dBDvXUBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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