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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c997273f5c864a8434343f297ba46c70e1a1ae42dc8e2c3dae32d20da67614aa' 
  AND token = '/ykNN43NAJcKqNnk6R667ElzS5FuQvwyvYxfhrqFpzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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