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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9e164d6c3f653f555bafe6c886497c4d6490c59f25d87c725ae6377468d099' 
  AND token = 'aL/0M/4dCGa8+/6QApNwpyfMEqWE7VUtngWL2es0WQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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