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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f4403039586c303057d31bd91e668266dba13e2c663373a69d96d40652fbc9' 
  AND token = 'cZ9/XQZqYjZ+Tn0EFmptB85tS7LIeCU3Vw114w1hAc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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