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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b660c8d7ff2c729cff09ad931b0c3b4b394278f4be8eb22acb379944c952dbe' 
  AND token = 'XQruxVkK35Y8ScMblHQ8BiAOftK5O1CI8SDOPm6zTXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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