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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b09e0773121edd371fa1c67ce1a0b986dba51a2e0630ee05d216043a519bbef' 
  AND token = 'q77qHO0iKeG7cEHyV+0ypWOrXvQnMhvHeeCqY4NlKVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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