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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0106e773418044495a3723cc6bbec2e226ae9c3ba0e6976532b1de8cbd8340a2' 
  AND token = 'mFiCCMQIsC6JRmSJ3eS83qoG+U0ixC9XZCr7JQqR6RM=' 
  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"
    }
  }
}