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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ae7944bf01a4b22c89b312dd67dd6c413d0f1968b45baf8b2e4dc46c87d9ca' 
  AND token = 'iT8yR4y0LuuNtMCnmab9CYNS6E93DsIQP6ZrDU5NkuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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