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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb4f33128348b294ab43fa698d31b97adf2debbe2ef1375d8976451ce663a8b' 
  AND token = 'DL4H8JjhqbTDHf6khhLI5ny7uLWzuTLe5C4psXb0KBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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