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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78f334f58aac3b08bc457d9155614f67a26b73f07180d42dd45146495679bd87' 
  AND token = 'baCGfjDqYdrOW7bYN6g1UR0h3BjOlnRefkLq6wBVyn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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