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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06148e5fa97e8d876f568f3cad720cfcc2f03c762a7dd3723b16eac5dea9aa3' 
  AND token = 'Rr8plkJgDqAoPt6pODQBlUn0zKnwgb/oIXElEbimCJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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