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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b707d44e847133a84d52cfb49ab6a00110ad8f4ef23d34d2c943a5bb6b05ddcf' 
  AND token = 'o0sa/nV+QQ4hQfXGGSvESSWcQ9pANixQmff8RaqEXAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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