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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e5fead0640b289123c5ce70cdd0b45802e49cd7dcabf8d96c2e738cf721c1f' 
  AND token = 'Pb45XGhtaU9J0vdTD+iizZy4OUYK8nCbVZEtMiG1dWU=' 
  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"
    }
  }
}