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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fef0c144a4dc00346ae503a691bed0671b40b6570775154352b24187fdf3d0' 
  AND token = 'XFRFaiT2rkzv5EVQkdvI+gEXqs2XbgN0hJIc9atbOxI=' 
  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"
    }
  }
}