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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccef498bb4a5732c22cfc5a85c3b5192975ed7b48f09b86246ae98667728073a' 
  AND token = 'tq+bxLFIrAYFExwuI5E+VBk4NKlBYQYwxCeu65izT7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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