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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c82dd5ea004c4b19bae8052fd4d18a08f6b1b2ee7409b5ca73c2fa054cb0ae' 
  AND token = 'tFrB88rIVB8xWec0+hRhfX9oAdv+A4HamTvU3oHpQ3I=' 
  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"
    }
  }
}