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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d56a4a08cb79ccd771f7c25d2f682130f3d51ba8360cd2e972d4a0094e35ad3' 
  AND token = 'eKMILAbNlsVRSers69nbyELYgZ6R1GrOHBWuVhcjWtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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