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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76fbee4427c5ddea7512e5c2b2de4b936c9f9cd5768b81a9da2e3c809832923' 
  AND token = 'xyXct4M+TdM0BOwbNO5RfhwyfRN4fQso+y2fYXcFs0Q=' 
  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"
    }
  }
}