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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f14a1d844695b7c8266de91babe0c2ab76c637452eb2b17139edb6b8c87377c' 
  AND token = 'LzqW5IevFdfjQd8GXZ0TY2Br60guuTfARvjV2oue34I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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