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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11229237f2af74f13fafff23e1bddfd654d81adc227f91ba1d601bf8eadb9b08' 
  AND token = '0n/SoMH58qZEE3rhXb3h5Vq4Lc7mzcRKycnquvaB8QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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