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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e4b86065108dbdb209be01b9d1461268c7ed7a91034afef62ef5d32239d9eb6' 
  AND token = 'wbm6yj6JwMgPsVPDEYXQm4mtfR6x1fAK73ggniyywYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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