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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9019098856329d5f60bd89d61901b73bf037b6cfc5ed2e3ccc3f7a2bb5a95cfe' 
  AND token = 'h/u4Irnt8llGv1WGDxcw0sD2NZdm9n93Lk1NPQiymzY=' 
  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"
    }
  }
}