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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6645f32a8968c61ffa215f476460d7a5a98d4e1d3976cd438eaa6ba984063d57' 
  AND token = 'h6yp+ez4juVrEeRUCefHp5HRy5cURqWwQD3sinRVkj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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