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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa16f36fe4cdfaab7679086e564640e6cd362a08df7ae3c6a1764dd2ebf7ead' 
  AND token = 'q/c429Tv7EG/kI/qJNMbqJDg9zaXOQHN9NAHH0I/pA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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