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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3788d54f8d1c6f2942907fc1c873ff2e11eb489d42ef0880a205a293ece90a6e' 
  AND token = '6JIqludPYvgARL9d2fzubkyLf+O2+xa7F2nuL7+t0fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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