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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c115d4830eac8df2a9c877198b4c3ccd444811346d4309e9961bda99e6a1059' 
  AND token = 'bN5jBFzmiWLIBW8ETw50i7pWurKjBc8Y4f6Be5nSf3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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