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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f5d42b3b5cdf06e401c1eb76f21d1a78b961f03dccabbd9efa4ff72edfac31' 
  AND token = '7mH75LPE0w6ZGNyyrjIlwaF6PE8sYfZNx+MitsuOyxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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