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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '621d7efd26030eb92cb310028b276b43234326e8462a7045f0f91f69e342e318' 
  AND token = 'y/Vge3zVIvCAxcJIIZzz1MYLCuMjpTFisA9YkqrH8/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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