SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2d7e7baa4e596b13639f04ba716300492983d5d00bc0f5d27198a9a9b2386c' 
  AND token = 'S6FHgHuDX7oEW/PXp0m4FKDh7+xC8qdwAMuOPZWg1Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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