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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083502099ac770452fff7d9ce3bfc1bbafa9487f53314a8dafaec49bcc516ce1' 
  AND token = 'UWSfH3mgB6fAL92n38ki1mt7jks/Qr8bHkCwYYuPMqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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