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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8990e43aa80ee43c01cfb94c8cc1a78c4588150c6577cc7c1355fba243a0a260' 
  AND token = 'M//WBZMx/d+xOp3fzw64HOLzS71qGrtXzVKxHbfzzq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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