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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b114fbbab6549276e2b73a7ca1b8936d78e96217c9602dc79de38830062e08c7' 
  AND token = 'K21jmmh82oP2MamYRpsPFa2j6Zxk/REWZKqaLia5Q6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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