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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0d50d845d1d2245b1e1379262b86bd9d13b1b34bb664f1b8031bfafe26b1d0' 
  AND token = 'pmnlB2PJ6sEJAwFRM2fHmPNoC6pQi4O4ISemsz/+/uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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