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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2752be2aa0ffd5bd5e3c58dfeb7e8a761ba708c39cb7691a64c3a669b012b7f' 
  AND token = 'knUu8NDWjWlxTJPVgcG/laQwMolxW6WBjau/S4k2VTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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