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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79727101c781a830e86fa1a9f491d22af4a6cc616ba3da8690eb7ff9e1ee66a' 
  AND token = 'Vm8vOyO/hELHmrClTNcCkDER8ClJbhFJ8Y1bibj2eEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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