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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6864d79db9511b5f97be562661ac2d52c7ba7a74b48cb575fb797618f122913' 
  AND token = 'iiao4z6/DMwVuMpLIeyJYvCGkW/6IvzbGykddFFxQMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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