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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ba76072a9e00f9ae846e7d3f134c5a9bf4ad01d1e46561689620e50b96e24b' 
  AND token = 'YauKH+2MIhymsg97bsMe+tLc1xmOsv1+dcmd7nBFMf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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