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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f898b81f3876a075854a681b13c48acac79911b77d2bda8952e9e01683c27ec' 
  AND token = 'JpxQEQEPxU2NNDJ0LaKkTBossCdZbT5ChgSShoBDC34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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