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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e66f1aa91f541719739927c03e5065c9f4b3db0050186eecd68086d8f8622a93' 
  AND token = 'c2Ugv0PDai6ZKHGViSm8qn6EuEIm3seuNQDz5j5zTVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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