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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93f5b584723276f01ee6a4f53461737045f8fc576021dc7722f9812eec56798' 
  AND token = '6D3XZOx7X1PArKKaFR7W0XYOUVgKg030IcVWvxoYHas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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