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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a7d6bce22ab56c4a32552ffc2e7edd52bddfc3c0f4bdd328aa78d8588e7bef' 
  AND token = 'JCUVDbJ0zcdBDIwSOAX0+DW4/9KaOJLDDbbXde0bXSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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