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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33f8405d354c398501a32e70737e36355c1bc2acf9ce403c26a2bc433b65492' 
  AND token = 'R7ZCegO6GOmn2OM0LCjN6IrC3iTTFRm0NIOK86mAa9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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