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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ec455b7fce0aaa006861a33fa0aa16bfb2e417fb8c4dda607b21d841ba6cbb7' 
  AND token = 'DJ/Ya1zP/2QEpBWTSwZCVvIudn3HJQ1Jo2vEulqNPFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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